Locomotive-stoker.



E. P. CRAWFORD. LGLOMOTIVE STOKER. ILIPLIQA I'IOX FILED APR.S, 1909.

Patented J an. 6, 1914.

a SHEETS-SHEET i.

D. F. CRAWFORD. v LOGOMOTIVE STOKER. APPLICATION FILED 11mm, 1909.

Patented 'Jan. 6, 1914 3 SHEBTSSHEBT 2.

Ill I INVENTOR Mmesss D. P. CRAWFORD.

LOGOMOTIVE STOKER. APPLICATION FILED APILB, 1909.

Patented Jan 6, 1914.

a SHEETS-SHEET a.

1,083,432 if i toconorrvn-sroxnn.

Specification of Letters Patent;

Application filed April 3,1909. Serial No. 487,616.

' -.'-'i)avrnr. CRAWFORD, or PITTSBURGH, PENNSYLVANIA.

To all whom it mag/concern Be it known that I',-- DAVID F. CRAWFORD, a citizenof the United States, residing at Pittstinigh, in the countyof Allegheny and n c v State of Pennsylvanla, have invented certain new and useful Improvements in Locomotive-Stokers, of. which the following is a specification.

' The invention relates to locomotive stokers and particularly to those employing an underfeed. The invention has for its primary objects; the provision of an arrangement whereby a more uniform distribution of fuel over the grates issecured; and the provision of .an arrangement of grates wherein the flue sheet is. protected from wide variation in temperature and consequent 1-n- ]ur1ous strains due to the operation'of the drop grate and wherein the drop grate is readily accessible without removing the contents of the furnace. One embodiment of the invention is illustrated. in the accomwith respect to the showing in Figure 1, it

panying drawings, wherein e I v Figure 1 is a horizontal section through one half of the fire-box above the grates.

' Figure 2 is a vertical section through the center of the fire-box,

Figure 3 'is' a two part vertical section on the lines IIIIII- of Figure 2, and Figure 4 isasection on the line IV-IV of Fig 1. 1 I v As the invention resides particularly in the furnace, only so much of the locomotive structure is shown as is necessary to indicate the relation of the furnace parts thereto, and

will be understood that the other half of the furnace is substantially the-same, as the half shown. The principal parts shown may be enumerated as follows, 1 .is the fire-box, which may beof any approved form; 2 1S the underfeed trough extending into the center of the furnace, and gradually decreasi g in depth as indicated mostclearly .in Figure 2; 3 is the feed casing to the rear and below the door 4 into the furnace, which casing is provided with the hopper 5 for the the fire-box; 8 is an'agitatormounted for reciprocation in the'bo'ttom of the trough 2 and carried by the rod 9; 10 are the side grate bars mounted .forrotation in sockets formed in the. framework'of the furnacei'as' indicated in Figure 3; 11 is a grate bar mounted at the front end of the feed trouglni.

and also adapted to be rotated; %is one of the drop grates located at the extrem'r'ea r end of the furnace (Figure 1 13 is an air chamber located adjacent the trough (Fig ure 3) and provided with inwardly directed Patented Jmtc, 19114..

twyers 14: for supplying air to the fuel in the trough; and 14 isa pipe leading from" a suitably located floor for supplying pres sure to the chamber 13.

The rock or grate bars 10 and 11 are provided with projectingfingers 14; and' have at their ends downwardly projecting'operating arms 15' (Figure 2), which arms are' pivoted at their lower ends to the connecting rod 16 which is pivoted at its rear endto the rod 16 connected to the operating handle 17. 'lhese'bars'are downwardly iii-- clined from their inner to their bute'r'e'dges as indicated in Figure 3, which arrangement has been found to promote the proper spreading of the fuel to the outer edges of the furnace. The drop grates 12 are also rearwardly inclined as indicated in Figure 2, v

the purpose here alsobeing to provide for a more ready movement of the fuel 'toward the'rear end of the furnace. ,Experience has indicated that 'the tendencv'of the fuel is to collect at the center of the furnace leaving the sides and rear of the grate with insu'flicicnt fuel, and-by the arrangement above described this tendencyis to a large extent over-come and a proper distr lmtion of the fuel is secured. provided with a hollow piston 17 which is connected to the rock shaft 1.8 by means of the connecting rod 19 and crank arm 2O. The feed piston 6 is operated from this. rock shaft 18 by means of the crank arm 21. and connecting rod 22 (Figure 2).

g g The agitz'itor rod 9 is also operated from the rock shaft. 18 by means of the crank 23 and con-' nccting rod 24. r

Tl1e placing of thcsdrop grate 12 at the rear of the side. grate instead of at "thefront thereof constitutes one of the features .of my inven'liom'and is aulvantagcons in I The cylinder 7 is sheet to the sudden cooling which occurs in the ordinary type of congtruction when the drop grate 1S 'bperatcd. This sudden change of tenn'pcrature at the the flue sheet produces considerable strain inci dent to the contraction of the metal, and asa result leakage isconstantly occurring at this point. The drop grate is also more 'accessible at the rear end of the furnacethan at the front thereof, and in case of a displacement or sticking of the grate it may be'readily attended to and remedied With- 7 out the necessity of removing all the fuel from the furnace, as is the case Where the v drop grate'islocated at the front of the furnace and sticking thereof or displacement occurs. Other advantages incident to.

the construction will be apparent to those skilled in the art.

The drop grate 12 is pivoted at 25 as in dicated in Fig. 4, and is operated by the toggle links 26 and 27 pivoted together with arule joint at 28, and engaged by the fork 29 carried by the bar 30.

reoiprocated by the lever 31.

It Will-be apparent thatthe invention is applicable to locomotive furnaces employing various types. ofun derfeed mechanism, and that the feature of a rear drop grate is not'limited in use orutility to a construction employing a single feed trough or to a construction in which suchdrop grate is at the side of the furnace, the only requirement being that the drop grate be placed-to the rear of the furnace and away from the flue sheet as opposed to the construction hereto fore employed having the drop grates at the front end of the furnace.

along the side of the trough, and substantially parallel to the side Wall ofthe furnace,

'40 a grate. extending and comprising a main portion consisting of a seriesof rock bars extending to the front end of the furnace, and a. drop grate portion to the rear of the main portion forming a continuation thereof and lying adjacent the rear end of the furnace, the said drop grate being 'pivotally supported adjacent oue edge on a line at right anglesto the axis of the trough and adapted to swing about such pivotal support. The bar 30 is 1 2. The combination with a locomotive furnace, of an underfeed trough extending into the furnace, a grate extending along the side of the trough, and a rearwardly'inclined drop grate located at therear end of the furnace and extending. transversely of the said grate.

-v In testimony whereof I have hereunto signed my name in the presence of the two subscribed Witnesses.

DAVID F. CRAWFORD.

Witnesses:

DAVID STONECIPHER, ARCHWORTH MARTIN. 

